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周界平移2
Author:
lai fung yee
GeoGebra
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四邊形的特性
【案例】2013年安徽高考15题
兩組對邊相等和有直角的四邊形
球体的体积推导（优化版）
找出對稱軸
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aaa aaa aaa aaa
S5 Permutation and Combination
聯立方程式
【基測數學94v1 單選31】圓的組合面積
折扣 例6的副本
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Trapezoid
Volume
Indefinite Integral
Square
Differential Equation